128550336 has 56 divisors (see below), whose sum is σ = 341162640. Its totient is φ = 42719232.

The previous prime is 128550319. The next prime is 128550341. The reversal of 128550336 is 633055821.

It is a junction number, because it is equal to n+sod(n) for n = 128550297 and 128550306.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77710 + ... + 79346.

It is an arithmetic number, because the mean of its divisors is an integer number (6092190).

Almost surely, 2^128550336 is an apocalyptic number.

128550336 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128550336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (170581320).

128550336 is an abundant number, since it is smaller than the sum of its proper divisors (212612304).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128550336 is a wasteful number, since it uses less digits than its factorization.

128550336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2061 (or 2051 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 128550336 is about 11338.0040571522. The cubic root of 128550336 is about 504.6896580296.

The spelling of 128550336 in words is "one hundred twenty-eight million, five hundred fifty thousand, three hundred thirty-six".